小麦重组自交系群体抽穗期QTL分析

QTL mapping of heading date of wheat recombinant inbred line population

为了对小麦抽穗期进行QTL初步定位,并进行遗传分析,以CI12633×扬麦9号重组自交系(RIL)为材料,在3年9次试验中,记载小麦抽穗期,采用复合区间作图法进行小麦抽穗期QTL分析。共检测到7个QTL,分别位于1A、4D、5B、6B和7A 5条染色体上,贡献率为5.76%~15.26%。其中位于4D染色体上分子标记Xgpw5191至Xmag1163之间的Qhd-4D基因在3年9次试验中都被检测到,是一个稳定表达的与抽穗期相关的基因。同时,不同环境条件下检测到不同的抽穗期QTL,说明环境对小麦抽穗期影响较大。

A recombinant inbred line ( RIL) population derived from a cross between two common wheat cultivars CI12633/Yangmai9#was used for QTL mapping of heading date. Data was collected from 9 repeated trials in three years. Seven QTLs located on chromosomes 1A,4D,5B,6B and 7A were detected, contributing 5?76% to 15?26% to the total phenotypic variation by composite interval mapping ( CIM ) . The gene Qhd?4D on 4D, between marker Xgpw5191 and Xmag1163, detected in all nine trials, was a stable expression gene related to heading date. Various QTLs were detected in different environments, suggesting that heading date is sensitive to environment.